As a general rule, TH watches manufactured before 2015, the movement base is ETA. After 2015 movement base is somewhat shifted to Sellita. Probably due to limitation of supply and cost constraints buying the movement from ETA/Omega group. This is not perfectly true in all cases but I've read this statement somewhere in the forum and holds some valid significance. For quality between ETA and Sellita, somehow ETA > Sellita is more reliable base on what I've read. Not really sure if this is really true. HTH
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